1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * tick internal variable and functions used by low/high res code
  4 */
  5#include <linux/hrtimer.h>
  6#include <linux/tick.h>
  7
  8#include "timekeeping.h"
  9#include "tick-sched.h"
 10
 11#ifdef CONFIG_GENERIC_CLOCKEVENTS
 12
 13# define TICK_DO_TIMER_NONE	-1
 14# define TICK_DO_TIMER_BOOT	-2
 15
 16DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 17extern ktime_t tick_next_period;
 18extern ktime_t tick_period;
 19extern int tick_do_timer_cpu __read_mostly;
 20
 21extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
 22extern void tick_handle_periodic(struct clock_event_device *dev);
 23extern void tick_check_new_device(struct clock_event_device *dev);
 24extern void tick_shutdown(unsigned int cpu);
 25extern void tick_suspend(void);
 26extern void tick_resume(void);
 27extern bool tick_check_replacement(struct clock_event_device *curdev,
 28				   struct clock_event_device *newdev);
 29extern void tick_install_replacement(struct clock_event_device *dev);
 30extern int tick_is_oneshot_available(void);
 31extern struct tick_device *tick_get_device(int cpu);
 32
 33extern int clockevents_tick_resume(struct clock_event_device *dev);
 34/* Check, if the device is functional or a dummy for broadcast */
 35static inline int tick_device_is_functional(struct clock_event_device *dev)
 36{
 37	return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 38}
 39
 40static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
 41{
 42	return dev->state_use_accessors;
 43}
 44
 45static inline void clockevent_set_state(struct clock_event_device *dev,
 46					enum clock_event_state state)
 47{
 48	dev->state_use_accessors = state;
 49}
 50
 51extern void clockevents_shutdown(struct clock_event_device *dev);
 52extern void clockevents_exchange_device(struct clock_event_device *old,
 53					struct clock_event_device *new);
 54extern void clockevents_switch_state(struct clock_event_device *dev,
 55				     enum clock_event_state state);
 56extern int clockevents_program_event(struct clock_event_device *dev,
 57				     ktime_t expires, bool force);
 58extern void clockevents_handle_noop(struct clock_event_device *dev);
 59extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 60extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
 61
 62/* Broadcasting support */
 63# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 64extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 65extern void tick_install_broadcast_device(struct clock_event_device *dev);
 66extern int tick_is_broadcast_device(struct clock_event_device *dev);
 
 67extern void tick_suspend_broadcast(void);
 68extern void tick_resume_broadcast(void);
 69extern bool tick_resume_check_broadcast(void);
 70extern void tick_broadcast_init(void);
 71extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 72extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 73extern struct tick_device *tick_get_broadcast_device(void);
 74extern struct cpumask *tick_get_broadcast_mask(void);
 75# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
 76static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
 77static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
 78static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
 79static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 
 80static inline void tick_suspend_broadcast(void) { }
 81static inline void tick_resume_broadcast(void) { }
 82static inline bool tick_resume_check_broadcast(void) { return false; }
 83static inline void tick_broadcast_init(void) { }
 84static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
 85
 86/* Set the periodic handler in non broadcast mode */
 87static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
 88{
 89	dev->event_handler = tick_handle_periodic;
 90}
 91# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
 92
 93#else /* !GENERIC_CLOCKEVENTS: */
 94static inline void tick_suspend(void) { }
 95static inline void tick_resume(void) { }
 96#endif /* !GENERIC_CLOCKEVENTS */
 97
 98/* Oneshot related functions */
 99#ifdef CONFIG_TICK_ONESHOT
100extern void tick_setup_oneshot(struct clock_event_device *newdev,
101			       void (*handler)(struct clock_event_device *),
102			       ktime_t nextevt);
103extern int tick_program_event(ktime_t expires, int force);
104extern void tick_oneshot_notify(void);
105extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
106extern void tick_resume_oneshot(void);
107static inline bool tick_oneshot_possible(void) { return true; }
108extern int tick_oneshot_mode_active(void);
109extern void tick_clock_notify(void);
110extern int tick_check_oneshot_change(int allow_nohz);
111extern int tick_init_highres(void);
112#else /* !CONFIG_TICK_ONESHOT: */
113static inline
114void tick_setup_oneshot(struct clock_event_device *newdev,
115			void (*handler)(struct clock_event_device *),
116			ktime_t nextevt) { BUG(); }
117static inline void tick_resume_oneshot(void) { BUG(); }
118static inline int tick_program_event(ktime_t expires, int force) { return 0; }
119static inline void tick_oneshot_notify(void) { }
120static inline bool tick_oneshot_possible(void) { return false; }
121static inline int tick_oneshot_mode_active(void) { return 0; }
122static inline void tick_clock_notify(void) { }
123static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
124#endif /* !CONFIG_TICK_ONESHOT */
125
126/* Functions related to oneshot broadcasting */
127#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
 
128extern void tick_broadcast_switch_to_oneshot(void);
 
129extern int tick_broadcast_oneshot_active(void);
130extern void tick_check_oneshot_broadcast_this_cpu(void);
131bool tick_broadcast_oneshot_available(void);
132extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
133#else /* !(BROADCAST && ONESHOT): */
 
134static inline void tick_broadcast_switch_to_oneshot(void) { }
 
135static inline int tick_broadcast_oneshot_active(void) { return 0; }
136static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
137static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
138#endif /* !(BROADCAST && ONESHOT) */
139
140#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
141extern void tick_broadcast_offline(unsigned int cpu);
142#else
143static inline void tick_broadcast_offline(unsigned int cpu) { }
144#endif
145
146/* NO_HZ_FULL internal */
147#ifdef CONFIG_NO_HZ_FULL
148extern void tick_nohz_init(void);
149# else
150static inline void tick_nohz_init(void) { }
151#endif
152
153#ifdef CONFIG_NO_HZ_COMMON
154extern unsigned long tick_nohz_active;
155extern void timers_update_nohz(void);
156# ifdef CONFIG_SMP
157extern struct static_key_false timers_migration_enabled;
158# endif
159#else /* CONFIG_NO_HZ_COMMON */
160static inline void timers_update_nohz(void) { }
161#define tick_nohz_active (0)
162#endif
163
 
 
 
 
 
 
164DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
165
166extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
167void timer_clear_idle(void);

 
  1/*
  2 * tick internal variable and functions used by low/high res code
  3 */
  4#include <linux/hrtimer.h>
  5#include <linux/tick.h>
  6
  7#include "timekeeping.h"
  8#include "tick-sched.h"
  9
 10#ifdef CONFIG_GENERIC_CLOCKEVENTS
 11
 12# define TICK_DO_TIMER_NONE	-1
 13# define TICK_DO_TIMER_BOOT	-2
 14
 15DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 16extern ktime_t tick_next_period;
 17extern ktime_t tick_period;
 18extern int tick_do_timer_cpu __read_mostly;
 19
 20extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
 21extern void tick_handle_periodic(struct clock_event_device *dev);
 22extern void tick_check_new_device(struct clock_event_device *dev);
 23extern void tick_shutdown(unsigned int cpu);
 24extern void tick_suspend(void);
 25extern void tick_resume(void);
 26extern bool tick_check_replacement(struct clock_event_device *curdev,
 27				   struct clock_event_device *newdev);
 28extern void tick_install_replacement(struct clock_event_device *dev);
 29extern int tick_is_oneshot_available(void);
 30extern struct tick_device *tick_get_device(int cpu);
 31
 32extern int clockevents_tick_resume(struct clock_event_device *dev);
 33/* Check, if the device is functional or a dummy for broadcast */
 34static inline int tick_device_is_functional(struct clock_event_device *dev)
 35{
 36	return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 37}
 38
 39static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
 40{
 41	return dev->state_use_accessors;
 42}
 43
 44static inline void clockevent_set_state(struct clock_event_device *dev,
 45					enum clock_event_state state)
 46{
 47	dev->state_use_accessors = state;
 48}
 49
 50extern void clockevents_shutdown(struct clock_event_device *dev);
 51extern void clockevents_exchange_device(struct clock_event_device *old,
 52					struct clock_event_device *new);
 53extern void clockevents_switch_state(struct clock_event_device *dev,
 54				     enum clock_event_state state);
 55extern int clockevents_program_event(struct clock_event_device *dev,
 56				     ktime_t expires, bool force);
 57extern void clockevents_handle_noop(struct clock_event_device *dev);
 58extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 59extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
 60
 61/* Broadcasting support */
 62# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 63extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 64extern void tick_install_broadcast_device(struct clock_event_device *dev);
 65extern int tick_is_broadcast_device(struct clock_event_device *dev);
 66extern void tick_shutdown_broadcast(unsigned int cpu);
 67extern void tick_suspend_broadcast(void);
 68extern void tick_resume_broadcast(void);
 69extern bool tick_resume_check_broadcast(void);
 70extern void tick_broadcast_init(void);
 71extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 72extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 73extern struct tick_device *tick_get_broadcast_device(void);
 74extern struct cpumask *tick_get_broadcast_mask(void);
 75# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
 76static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
 77static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
 78static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
 79static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 80static inline void tick_shutdown_broadcast(unsigned int cpu) { }
 81static inline void tick_suspend_broadcast(void) { }
 82static inline void tick_resume_broadcast(void) { }
 83static inline bool tick_resume_check_broadcast(void) { return false; }
 84static inline void tick_broadcast_init(void) { }
 85static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
 86
 87/* Set the periodic handler in non broadcast mode */
 88static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
 89{
 90	dev->event_handler = tick_handle_periodic;
 91}
 92# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
 93
 94#else /* !GENERIC_CLOCKEVENTS: */
 95static inline void tick_suspend(void) { }
 96static inline void tick_resume(void) { }
 97#endif /* !GENERIC_CLOCKEVENTS */
 98
 99/* Oneshot related functions */
100#ifdef CONFIG_TICK_ONESHOT
101extern void tick_setup_oneshot(struct clock_event_device *newdev,
102			       void (*handler)(struct clock_event_device *),
103			       ktime_t nextevt);
104extern int tick_program_event(ktime_t expires, int force);
105extern void tick_oneshot_notify(void);
106extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
107extern void tick_resume_oneshot(void);
108static inline bool tick_oneshot_possible(void) { return true; }
109extern int tick_oneshot_mode_active(void);
110extern void tick_clock_notify(void);
111extern int tick_check_oneshot_change(int allow_nohz);
112extern int tick_init_highres(void);
113#else /* !CONFIG_TICK_ONESHOT: */
114static inline
115void tick_setup_oneshot(struct clock_event_device *newdev,
116			void (*handler)(struct clock_event_device *),
117			ktime_t nextevt) { BUG(); }
118static inline void tick_resume_oneshot(void) { BUG(); }
119static inline int tick_program_event(ktime_t expires, int force) { return 0; }
120static inline void tick_oneshot_notify(void) { }
121static inline bool tick_oneshot_possible(void) { return false; }
122static inline int tick_oneshot_mode_active(void) { return 0; }
123static inline void tick_clock_notify(void) { }
124static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
125#endif /* !CONFIG_TICK_ONESHOT */
126
127/* Functions related to oneshot broadcasting */
128#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
129extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
130extern void tick_broadcast_switch_to_oneshot(void);
131extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
132extern int tick_broadcast_oneshot_active(void);
133extern void tick_check_oneshot_broadcast_this_cpu(void);
134bool tick_broadcast_oneshot_available(void);
135extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
136#else /* !(BROADCAST && ONESHOT): */
137static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }
138static inline void tick_broadcast_switch_to_oneshot(void) { }
139static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
140static inline int tick_broadcast_oneshot_active(void) { return 0; }
141static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
142static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
143#endif /* !(BROADCAST && ONESHOT) */
144
 
 
 
 
 
 
145/* NO_HZ_FULL internal */
146#ifdef CONFIG_NO_HZ_FULL
147extern void tick_nohz_init(void);
148# else
149static inline void tick_nohz_init(void) { }
150#endif
151
152#ifdef CONFIG_NO_HZ_COMMON
153extern unsigned long tick_nohz_active;
154#else
 
 
 
 
 
155#define tick_nohz_active (0)
156#endif
157
158#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
159extern void timers_update_migration(bool update_nohz);
160#else
161static inline void timers_update_migration(bool update_nohz) { }
162#endif
163
164DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
165
166extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);